After thinking about it, the last service call I had on a balancer was about 10 years ago and the factory sent me a new one for a very large double hung that needed a stronger unit. Window4U is right it has become a non issue. The constant force is best for longivity, and the block and tackle maybe shines a little for a dh over a kitchen sink and is replaced easier but in 99% of the windows out there both solved the longivity issue and are miles ahead of the old spiral system.

why don't you tell me which system is better for new construction of which system has tested to more cycles of use.

From what I've heard the block and tackle system tests several times longer for cycles of use. I would say the block and tackle is better for longevity. Go figure. Like the other posts have stated, however, both types are much more problem free than balance systems from 20 years ago. I'm actually fine with either one.

why don't you tell me which system is better for new construction of which system has tested to more cycles of use.

From what I've heard the block and tackle system tests several times longer for cycles of use. I would say the block and tackle is better for longevity. Go figure. Like the other posts have stated, however, both types are much more problem free than balance systems from 20 years ago. I'm actually fine with either one.

I don't know that I've heard either on make much noise??? Here's my take: Constant Force= more even and effortless operation, Block and tackle: better for new construction, last longer. Either way: they are both decent, unlikely to have issues, and cheap to replace if they do.

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